3.10 ALC
The automatic luminance control (ALC) circuit adjusts the LED dimming by changing the LED current
automatically in response to the brightness of the surroundings. An external photodiode or similar
luminance sensor must be connected for the ALC automatic control to function. The luminance sensor
is connected to PD and must be set to increase the PD input current in response to increasing
luminance of the surroundings. In the typical application circuit in section 13, the SM8152A VREF
terminal is used and the luminance sensor photodiode is connected between PD and VREF
3.11 JTAG & ETM interface connector
In case of KF350 mass production, the JTAG & ETM interface connector will not be mount on board.
That is only for developing and software debugging purpose.( It will not be mounted on mass
production PCB)
- 46 -
3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 14 Average Iout vs Lux on photo sensor
Figure 15 JTAG & ETM(Embedded Trace Module) interface connector
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G1
G2
G3
G4
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CN101
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2V62_VIO
1V8_SD
TRACEPKT5
TRACEPKT6
TRACEPKT7
TRACECLK
PIPESTAT0
PIPESTAT1
PIPESTAT2
TRACESYNC
TRSTn
TDI
TMS
TCK
RTCK
TDO
EXTRSTn
TRIG_IN
TRACEPKT0
TRACEPKT1
TRACEPKT2
TRACEPKT3
TRACEPKT4